{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://modelcontextprotocol.io/ext-tasks/schema.json",
  "title": "MCP Tasks Extension",
  "description": "JSON Schema for MCP Tasks extension protocol messages. Extension Identifier: io.modelcontextprotocol/tasks",
  "$defs": {
    "CancelTaskRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "jsonrpc": {
          "type": "string",
          "const": "2.0"
        },
        "id": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "integer",
              "minimum": -9007199254740991,
              "maximum": 9007199254740991
            }
          ]
        },
        "method": {
          "type": "string",
          "const": "tasks/cancel"
        },
        "params": {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            }
          },
          "required": [
            "taskId"
          ],
          "additionalProperties": false
        }
      },
      "required": [
        "jsonrpc",
        "id",
        "method",
        "params"
      ],
      "additionalProperties": false
    },
    "CancelTaskResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "_meta": {
          "type": "object",
          "properties": {
            "progressToken": {
              "anyOf": [
                {
                  "type": "string"
                },
                {
                  "type": "integer",
                  "minimum": -9007199254740991,
                  "maximum": 9007199254740991
                }
              ]
            },
            "io.modelcontextprotocol/related-task": {
              "type": "object",
              "properties": {
                "taskId": {
                  "type": "string"
                }
              },
              "required": [
                "taskId"
              ],
              "additionalProperties": false
            }
          },
          "additionalProperties": {}
        }
      },
      "additionalProperties": {}
    },
    "CancelledTask": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "taskId": {
          "type": "string"
        },
        "status": {
          "type": "string",
          "const": "cancelled"
        },
        "statusMessage": {
          "type": "string"
        },
        "createdAt": {
          "type": "string"
        },
        "lastUpdatedAt": {
          "type": "string"
        },
        "ttlMs": {
          "anyOf": [
            {
              "type": "number"
            },
            {
              "type": "null"
            }
          ]
        },
        "pollIntervalMs": {
          "type": "number"
        }
      },
      "required": [
        "taskId",
        "status",
        "createdAt",
        "lastUpdatedAt",
        "ttlMs"
      ],
      "additionalProperties": false
    },
    "CompletedTask": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "taskId": {
          "type": "string"
        },
        "status": {
          "type": "string",
          "const": "completed"
        },
        "statusMessage": {
          "type": "string"
        },
        "createdAt": {
          "type": "string"
        },
        "lastUpdatedAt": {
          "type": "string"
        },
        "ttlMs": {
          "anyOf": [
            {
              "type": "number"
            },
            {
              "type": "null"
            }
          ]
        },
        "pollIntervalMs": {
          "type": "number"
        },
        "result": {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      },
      "required": [
        "taskId",
        "status",
        "createdAt",
        "lastUpdatedAt",
        "ttlMs",
        "result"
      ],
      "additionalProperties": false
    },
    "CreateTaskResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "allOf": [
        {
          "type": "object",
          "properties": {
            "_meta": {
              "type": "object",
              "properties": {
                "progressToken": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "integer",
                      "minimum": -9007199254740991,
                      "maximum": 9007199254740991
                    }
                  ]
                },
                "io.modelcontextprotocol/related-task": {
                  "type": "object",
                  "properties": {
                    "taskId": {
                      "type": "string"
                    }
                  },
                  "required": [
                    "taskId"
                  ],
                  "additionalProperties": false
                }
              },
              "additionalProperties": {}
            }
          },
          "additionalProperties": {}
        },
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "anyOf": [
                {
                  "type": "string",
                  "const": "working"
                },
                {
                  "type": "string",
                  "const": "input_required"
                },
                {
                  "type": "string",
                  "const": "completed"
                },
                {
                  "type": "string",
                  "const": "failed"
                },
                {
                  "type": "string",
                  "const": "cancelled"
                }
              ]
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs"
          ],
          "additionalProperties": false
        }
      ]
    },
    "DetailedTask": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "anyOf": [
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "const": "working"
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs"
          ],
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "const": "input_required"
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            },
            "inputRequests": {
              "type": "object",
              "propertyNames": {
                "type": "string"
              },
              "additionalProperties": {
                "anyOf": [
                  {},
                  {},
                  {}
                ]
              }
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs",
            "inputRequests"
          ],
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "const": "completed"
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            },
            "result": {
              "type": "object",
              "propertyNames": {
                "type": "string"
              },
              "additionalProperties": {}
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs",
            "result"
          ],
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "const": "failed"
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            },
            "error": {
              "type": "object",
              "propertyNames": {
                "type": "string"
              },
              "additionalProperties": {}
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs",
            "error"
          ],
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "const": "cancelled"
            },
            "statusMessage": {
              "type": "string"
            },
            "createdAt": {
              "type": "string"
            },
            "lastUpdatedAt": {
              "type": "string"
            },
            "ttlMs": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ]
            },
            "pollIntervalMs": {
              "type": "number"
            }
          },
          "required": [
            "taskId",
            "status",
            "createdAt",
            "lastUpdatedAt",
            "ttlMs"
          ],
          "additionalProperties": false
        }
      ]
    },
    "FailedTask": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "taskId": {
          "type": "string"
        },
        "status": {
          "type": "string",
          "const": "failed"
        },
        "statusMessage": {
          "type": "string"
        },
        "createdAt": {
          "type": "string"
        },
        "lastUpdatedAt": {
          "type": "string"
        },
        "ttlMs": {
          "anyOf": [
            {
              "type": "number"
            },
            {
              "type": "null"
            }
          ]
        },
        "pollIntervalMs": {
          "type": "number"
        },
        "error": {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      },
      "required": [
        "taskId",
        "status",
        "createdAt",
        "lastUpdatedAt",
        "ttlMs",
        "error"
      ],
      "additionalProperties": false
    },
    "GetTaskRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "jsonrpc": {
          "type": "string",
          "const": "2.0"
        },
        "id": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "integer",
              "minimum": -9007199254740991,
              "maximum": 9007199254740991
            }
          ]
        },
        "method": {
          "type": "string",
          "const": "tasks/get"
        },
        "params": {
          "type": "object",
          "properties": {
            "taskId": {
              "type": "string"
            }
          },
          "required": [
            "taskId"
          ],
          "additionalProperties": false
        }
      },
      "required": [
        "jsonrpc",
        "id",
        "method",
        "params"
      ],
      "additionalProperties": false
    },
    "GetTaskResult": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "allOf": [
        {
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          "properties": {
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              "properties": {
                "progressToken": {
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                    {
                      "type": "integer",
                      "minimum": -9007199254740991,
                      "maximum": 9007199254740991
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                  ]
                },
                "io.modelcontextprotocol/related-task": {
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                  "properties": {
                    "taskId": {
                      "type": "string"
                    }
                  },
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              },
              "additionalProperties": {}
            }
          },
          "additionalProperties": {}
        },
        {
          "anyOf": [
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              "properties": {
                "taskId": {
                  "type": "string"
                },
                "status": {
                  "type": "string",
                  "const": "working"
                },
                "statusMessage": {
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                },
                "createdAt": {
                  "type": "string"
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                "lastUpdatedAt": {
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                "pollIntervalMs": {
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              ],
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            },
            {
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                "taskId": {
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                },
                "status": {
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                  "const": "input_required"
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                "statusMessage": {
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                "createdAt": {
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                      {},
                      {}
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              ],
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            {
              "type": "object",
              "properties": {
                "taskId": {
                  "type": "string"
                },
                "status": {
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                  "const": "completed"
                },
                "statusMessage": {
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                "createdAt": {
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                "lastUpdatedAt": {
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            {
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              "properties": {
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                "status": {
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                },
                "statusMessage": {
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                "createdAt": {
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                "lastUpdatedAt": {
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              "additionalProperties": false
            },
            {
              "type": "object",
              "properties": {
                "taskId": {
                  "type": "string"
                },
                "status": {
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                  "const": "cancelled"
                },
                "statusMessage": {
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                "createdAt": {
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              "additionalProperties": false
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          ]
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      ]
    },
    "InputRequest": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "anyOf": [
        {},
        {},
        {}
      ]
    },
    "InputRequests": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {
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          {},
          {},
          {}
        ]
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    },
    "InputRequiredTask": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "taskId": {
          "type": "string"
        },
        "status": {
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        },
        "statusMessage": {
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        "createdAt": {
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        "lastUpdatedAt": {
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        "ttlMs": {
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              {}
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        }
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        "inputRequests"
      ],
      "additionalProperties": false
    },
    "InputResponse": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "anyOf": [
        {},
        {},
        {}
      ]
    },
    "InputResponses": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {
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          {},
          {},
          {}
        ]
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    },
    "Task": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "taskId": {
          "type": "string"
        },
        "status": {
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              "const": "working"
            },
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            },
            {
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              "const": "completed"
            },
            {
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              "const": "failed"
            },
            {
              "type": "string",
              "const": "cancelled"
            }
          ]
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        "statusMessage": {
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        "createdAt": {
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        "lastUpdatedAt": {
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        "lastUpdatedAt",
        "ttlMs"
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      "additionalProperties": false
    },
    "TaskStatusNotificationParams": {
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            {
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                "createdAt": {
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